Bluetooth: tester: fix build with BT_SMP_SC_ONLY
Bluetooth: tester: fix build with BT_SMP_SC_ONLY

bt_le_oob_set_legacy_tk is not defined with this
setting and this code is reachable only for legacy pairing

signed-off-by: Krzysztof Kopyściński <48568cfaa134e87f8b8a21a5eb21757e127be81c@codecoup.pl>

galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,finikorg/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr